Here’s an informal demo video, via programmer Jim Heintz, showing his SynthX 2 being used with the Ion AllStar Guitar MIDI controller.
With SynthX being used in this mode, you can change tunings and string assignment to increase its flexibility.
Note: SynthX is compatible with the iPad 1, but working with the Ion controller requires iPad 2 or better.

does this work with other apps like iKorg MS-20 or Animoog ?
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Other midi apps trigger note events when you press the fret buttons. SynthX guitar mode plays like a real guitar and requires you to strum or pluck the strings. As a result, SynthX guitar mode is almost immediately playable for people that know how to play guitar. Combined with the new “Solus”, 2 oscillator synth, SynthX2.0 is pretty fun to play and hear.
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Very classy. This sounded a bit like David Torn. I have my reservations, but this makes a nice addition to my view that the guitar is the best suited for multi-axis synth playing in real-time. Programming for string triggering is a hefty task compared with doing so for a keyboard, but the added emotiveness is obvious.
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I saw one of these controllers cheap at Best Buy. May have to go back, cause this could be fun!
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